time做“时间”时,是不可数名词,想必楼主已经掌握,不再累述；
time做下列意思时,是可数名词：
1,做次数 / 倍数,如：I go shopping three times a month./ 20 is four times as big as 5.
2,做“一段时间”,“一个时段”时,如：have a good / great / happy / wonderful / hard / bad / difficult ...time,do sth (for ) a short / long time.